linux-kernel - Re: [PATCH 1/1] IB/umem: use get_user_pages

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Message-ID: <20191112202927.GC5584@ziepe.ca>
Date:   Tue, 12 Nov 2019 16:29:27 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ira Weiny <ira.weiny@...el.com>, linux-rdma@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] IB/umem: use get_user_pages_fast() to pin DMA pages

On Fri, Nov 08, 2019 at 06:04:34PM -0800, John Hubbard wrote:
> And get rid of the mmap_sem calls, as part of that. Note
> that get_user_pages_fast() will, if necessary, fall back to
> __gup_longterm_unlocked(), which takes the mmap_sem as needed.
> 
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>  drivers/infiniband/core/umem.c | 17 ++++++-----------
>  1 file changed, 6 insertions(+), 11 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>

This can go through Andrew's tree if he takes this larger series,
otherwise I'll grab it

Thanks,
Jason